Updated on: Apr 15, 2010
It is well known that global variables are generally a bad thing. Although they can seem convenient, they have a number of major drawbacks. This lesson outlines the reasons you may wish to find alternatives to using globals and then shows a number of options in revTalk that allow sharing of da...
Updated on: Feb 14, 2011
This lesson describes how to detect edges in an image, using three variations of an edge detection mask. Sample code and example screen captures are provided.
Updated on: Mar 23, 2011
This lesson describes how to threshold an image. Sample code and example screen captures are provided.